Interpolating component generator for scanning line interpolator using intra-field and inter-field pseudo median filters

Claim 2

An interpolating component generator for a scanning line interpolator for an input image signal comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from said input image signal and providing an output signal based on said inter-field variation and said intra-field variation; an inter-field pseudo median filter unit for generating an inter-field pixel value to be used in interpolation by use of current field information and previous field information, of said input image signal, said inter-field pseudo median filter unit combining values for three or more pixels of said input image signal; an intra-field pseudo median filter unit for generating an intra-field pixel value to be used in interpolation by use of current field information of the input image signal, said intra-field pseudo median filter unit combining values for three or more pixels of said input image signal; and a mixing unit for mixing the inter-field pixel value and said intra-field pixel value according to said output signal from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation,, wherein said mixing unit is adapted to select, as a pixel to be used in interpolation, a value obtained by summing output signals from said intra-field and inter-field pseudo median filter units, according to said output signal from said inter-field/intra-field determination unit.

Claim 3

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; wherein said inter-field/intra-field determination unit comprises: an one-line memory for delaying said input image signal by one line; an one-field memory for delaying an output signal from said one-line memory by one field; a first adder for adding said output signal from the one-line memory to the input image signal; a second adder for adding an output signal from said one-field memory to the output signal from the one-line memory; a third adder for adding said output signal from the one-field memory to the input image signal; first to third low pass filters for low-pass filtering output signals from the first to third adders, respectively; first to third absolute value generators for receiving output signals from said first to third low pass filters and thereby generating absolute values, respectively; a mixer for mixing output signals from said second and third absolute value generators; and a comparator for comparing an output signal from said first absolute value generator with an output signal from said mixer and thereby outputting the comparison result as a determination control signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 4

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; wherein said inter-field/intra-field determination unit comprises: an one-line memory for delaying said input image signal by one line; an one-field memory for delaying an output signal from said one-line memory by one field; a first adder for adding said output signal from the one-line memory to the input image signal; a second adder for adding an output signal from said one-field memory to the output signal from the one-line memory; a third adder for adding said output signal from the one-field memory to the input image signal; first to third low pass filters for low-pass filtering output signals from the first to third adders, respectively; first to third absolute value generators for receiving output signals from said first to third low pass filters and thereby generating absolute values, respectively; a mixer for mixing output signals from said second and third absolute value generators; and a comparator for comparing an output signal from said first absolute value generator with an output signal from said mixer and thereby outputting the comparison result as a determination control signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 5

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; and wherein said inter-field pseudo median filter unit comprises, first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a one-field memory for delaying said output signal from the one-line memory by one field; fifth and sixth sample memories for sequentially delaying the output signal from the one-field memory by one clock and thereby generating pixel values (h and i); first to fourth 4×1 Max filters for detecting Maximum ones from four-pixel values (a, b, g, h), (b, c, h, i), (g, h, d, e), (h, i, e, f) received therein and outputting them, respectively; first to fourth 4×1 Min filters for detecting minimum ones from said four-pixel values and outputting them, respectively; a fifth 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 4×1 Max filters; a fifth 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 4×1 Min filters; an adder for adding an output signal from said fifth 4×1 Min filter to an output signal from said fifth 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 6

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; and wherein said inter-field pseudo median filter unit comprises, first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a one-field memory for delaying said output signal from the one-line memory by one field; fifth and sixth sample memories for sequentially delaying the output signal from the one-field memory by one clock and thereby generating pixel values (h and i); first to fourth 4×1 Max filters for detecting Maximum ones from four-pixel values (a, b, g, h), (b, c, h, i), (g, h, d, e), (h, i, e, f) received therein and outputting them, respectively; first to fourth 4×1 Min filters for detecting minimum ones from said four-pixel values and outputting them, respectively; a fifth 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 4×1 Max filters; a fifth 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 4×1 Min filters; an adder for adding an output signal from said fifth 4×1 Min filter to an output signal from said fifth 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 7

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a one-field memory for delaying said output signal from the one-line memory by one field; fifth sample memory for delaying said output signal from the one-field memory by one clock and thereby generating a pixel value (h); first to fourth 3×1 Min filters for detecting minimum ones from three-pixel values (a,b,h), (b,c,h), (d,h,e), (h,f,e) received therein and outputting them, respectively; first to fourth 3×1 Max filters for detecting Maximum ones from said three-pixel values and outputting them, respectively; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 3×1 Min filters; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 3×1 Max filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; and a 1/2 amplifier for 1/2 amplifying an output signal from the adder; a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 8

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a one-field memory for delaying said output signal from the one-line memory by one field; fifth sample memory for delaying said output signal from the one-field memory by one clock and thereby generating a pixel value (h); first to fourth 3×1 Min filters for detecting minimum ones from three-pixel values (a,b,h), (b,c,h), (d,h,e), (h,f,e) received therein and outputting them, respectively; first to fourth 3×1 Max filters for detecting Maximum ones from said three-pixel values and outputting them, respectively; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 3×1 Min filters; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 3×1 Max filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; and a 1/2 amplifier for 1/2 amplifying an output signal from the adder; a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 9

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a median value generator for receiving said pixel values (a to f) generated from the one-line memory and the first to fourth sample memories and thereby calculating a median value (s); first to fourth 3×1 Max filters for detecting Maximum ones from three-pixel values (a,b,s), (b,c,s), (d,e,s), (e,f,s) each including two pixel values and said median value, and outputting them, respectively; first to fourth 3×1 Min filters for detecting minimum ones from said three-pixel values and outputting them, respectively; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 3×1 Max filters; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 3×1 Min filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 10

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying an output signal from said one-line memory and thereby generating pixel values (d, e and f); a median value generator for receiving said pixel values (a to f) generated from the one-line memory and the first to fourth sample memories and thereby calculating a median value (s); first to fourth 3×1 Max filters for detecting Maximum ones from three-pixel values (a,b,s), (b,c,s), (d,e,s), (e,f,s) each including two pixel values and said median value, and outputting them, respectively; first to fourth 3×1 Min filters for detecting minimum ones from said three-pixel values and outputting them, respectively; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 3×1 Max filters; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 3×1 Min filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 11

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying said output signal from the one-line memory and thereby generating pixel values (d, e and f); first to fourth 2×1 Max filters for detecting Maximum ones from two-pixel values (a,b), (b,c), (d,e), (e,f) selected from said pixel values (a, b, c, d, e and f) received therein and outputting them, respectively; first to fourth 2×1 Min filters for detecting minimum ones from said two-pixel values received therein and outputting them, respectively; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 2×1 Max filters; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 2×1 Min filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.

Claim 12

An interpolating component generator for a scanning line interpolator using pseudo median filters comprising: an inter-field/intra-field determination unit for determining an intra-field variation and an inter-field variation from an input image signal; an inter-field pseudo median filter unit for generating a pixel value to be used in interpolation by use of current field information and previous field information of said input image signal; an intra-field pseudo median filter unit for generating a pixel value to be used in interpolation only by use of current field information of the input image signal; and wherein said intra-field pseudo median filter unit comprises: first and second sample memories for sequentially delaying said input image signal by one clock and thereby generating pixel values (a, b and c); a one-line memory for delaying the input image signal by one line; third and fourth sample memories for sequentially delaying said output signal from the one-line memory and thereby generating pixel values (d, e and f); first to fourth 2×1 Max filters for detecting Maximum ones from two-pixel values (a,b), (b,c), (d,e), (e,f) selected from said pixel values (a, b, c, d, e and f) received therein and outputting them, respectively; first to fourth 2×1 Min filters for detecting minimum ones from said two-pixel values received therein and outputting them, respectively; a 4×1 Min filter for detecting the minimum one from output signals of said first to fourth 2×1 Max filters; a 4×1 Max filter for detecting the Maximum one from output signals of said first to fourth 2×1 Min filters; an adder for adding an output signal from said 4×1 Min filter to an output signal from said 4×1 Max filter; a 1/2 amplifier for 1/2 amplifying an output signal from said adder; and a mixing unit for mixing output signals from said inter-field and intra-field pseudo median filter units according to output information from said inter-field/intra-field determination unit and thereby outputting a pixel value to be finally used in interpolation.